javac cannot be run, and furthermore does not seem installed

Question

I have a problem involving setting up Java.

I have installed the JRE, added its path to PATH, and set JAVA_HOME and CLASSPATH.

Answer 1

In order to use javac in cmd , JDK must be installed in your system...

javac will not work if you are pointing "bin" folder inside JRE (C:\Program Files\Java**jre7**\bin)

Please check for javac.exe inside your bin folder(C:\Program Files\Java**jdk1.7.0_45**\bin)

javac.exe must be inside JDK(C:\Program Files\Java\jdk1.7.0_45\bin) not inside JRE (C:\Program Files (x86)\Java\jre7\bin) "JRE doesn't come with a compiler. It is simply a java runtime environment. What you need is the developmental kit." in order to use compiler javac

For javac path(Points to remember while setting system env variable)

path = C:\Program Files (x86)\Java\jre7\bin this is wrong

path = C:\Program Files\Java\jdk1.7.0_45\bin this is correct

Make sure "javac.exe" must be inside your "C:\Program Files\Java\jdk1.7.0_45\bin"

Dont confuse with JRE and JDK both are totally different

if you dont have JDK pls download from this link http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html

reference thread for JDK VS JRE What is the difference between JDK and JRE?

Procedure:-

1. Install JDK

2. open cmd prompt

3. type "cd C:\Program Files\Java\jdk1.7.0_45\bin " press enter(path may change based on jdk version and 32bit and 64bit os version)

4. type "javac" press enter

its done

Now go and change your system environment variable path = C:\Program Files\Java\jdk1.7.0_45\bin

this will set the path permanently